Practice question
Question
A hydrocarbon (C and H only) weighing 0.26 g produces 0.88 g of CO₂ and 0.18 g of H₂O on complete combustion. What is its molecular formula if its molar mass is 26 g/mol? (Atomic masses: C = 12, H = 1, O = 16)
Explanation
Mass of C ≈ 0.24 g; mass of H = 0.02 g. Total = 0.26 g. Moles: C = 0.02, H = 0.02; ratio = 1 : 1; empirical formula = CH, mass = 13 g/mol. n = 26/13 = 2; molecular formula = C₂H₂.
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